In the previous chapter, we learned the important basics and key concepts of Hyperledger Fabric by building a blockchain-based supply chain for the food industry. In this chapter, we will continue learning and exploring the essential components of the Hyperledger project by exploring an important financial concept—a letter of credit (LC). You will almost certainly come across an LC example while learning about blockchain's application to finance, as it provides a perfect example of how certain thorny issues can be resolved.

Throughout this chapter, we will deepen our knowledge of Hyperledger Fabric and introduce several advanced tools, while also learning how to develop and manage scalable, highly interoperable business solutions based on Hyperledger.

In this chapter, we will take a look at the following main topics:

• Hyperledger Composer
• Enrollment and identity management in a Hyperledger network
• Writing Chaincode for an LC
• Hyperledger on IBM's cloud

An LC is far too complex a process to be fully implemented and covered in a single chapter, hence, we will restrict our attention to how to implement the main concepts.